Method of operatinq electric furnaces



(No Model.)

J. C. HOBBS. METHOD OF OPERATING ELECTRIC FURNACES.

No.v403,.752. Patented May 21 1889.

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omerb STATES QF @P RATlN Leeizren'ig NEW YORK.

ELECTRIC FURNACES.

EEBZFIGATIQH forming part of Letters Patent 1%. 403,752, dated May 21, L889n Application filed August 31, 1888 "10 (all whom it may concern:

- folio inn is :1 full, elenr, illlLi exact :1 0i i'ne inventiein which will enable illeil in the rt iii-he and use ihe same.

anal ifCO'iihl nii'alent as J UL 3H ed for i; in ihe innin it: 15 neeeissziry in eon- :ii'hin a lining 0r QilYGiUPO H gr resistance to the electric the charge itself, and (it the h resistznien the nns- :01; 11h; purpose.

he wles proeeas e eln .g'e, (Ci the eni the earhsn "er the 0011i "in the fii w oi the elem. as Well to the heat. The enmpositien thus prepnreilwns placed around the charge in the furnace, any nheut iwe and hall inches thick at the siuee and ten inches 21; the ends.

Other mlvan ages gained byt-hense of sawdust are:

Fil'Sii. Cleanliness. The charcoal afier'being subjected to the intense heat of the furnace becomes an inipzilpnble powder, iillingthe works and making it disagreeable for every one around the ivorlqn, This objection is wholly avoided by the use 01 snwilnst.

Several. iihemn reiiy u! vhnrenni. llhmlifznaces; and i (10 hereby (leelnre which it appeia Serial No. 281L230. (lie model.)

i lienlty of getting charcoal in snfiicient quantity and. of suitable quality is a serious 0bjeetion and drawback to its use.

Tllll'il. The sawdust-bakes itself intoa solid body at the bottom of the furnace Within an hour after the furnace is Sim-ted.

g'rent zlii ftllililf" because it enables the tap- This is a ping of the fur 15199 from the bottom Without i i i i i l i i danger of ei-ciggmg g, is is the ease with chareon li'iyteinpts lizLYO been made to tap in i this when ehnreonl was used, but they i i i hznl to he "bnmleneil eneeeeun nLelegging, cc to get the metal nut of the E furnace alter the run was made 1;,

i to 0001 011, $10 Lhzi and could he iifi-liiiliiki with ie'ngs, The consequence was that all this raw niaterinl taken out of the furnne after each i charge had to be reinelieil in erneibles in. by

solidi i' 'ez'iiexpense l H -U. km: All

of which is s, Figure 1 is it and 2 2i horizonial lien n -ie furnace in which my inll on H mnbeiiiei'i.

i the charge in the fur nice. l5 1e {\Qijiflkitfi at the ends of the charge, ihr iininger envelope of sawdust which lllLif-i Lhe ehzi-rgih' x \(Umi eni; info line particles in ii a5 Jinan s s HlWdLlSi would answer Ge ibeil my invention, what I mnl desire tn seeure by Letters i are i heinetheii ei-Mingnneleeiriefurnace of the kind ileserzheil, Whieh Pensists in enveloping-.01 covering the charge with wood eui into small pieees, sawdust, and then passing a current vhri'iug'h the lmrgegvhereby neees- Hn-r}; in nlinw the whole interior 0? the fun 1e metal heemne 5 tier to it inn) nnirheiable shape. This inthe wood is carbonized, nnbstainiiiilhy as set, 

